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they must be the lightest available (apart from maybe the polycarbonate type) but I wouldn't use them as they do not look as neat and I would be worried, probably unecessaril,y that they would let water and muck into the headset bearings.

I wouldn't be super keen to use the ones originally suggested but really like BBB Ultraspace carbon spacers. For all intents and purposes the same as a normal spacer (i.e. work the same and keep water out) but at a fraction of even a normal light carbon spacer. Cheap too!

Well then, be surprised - Extralite delrin and POP aluminum are almost the same weight. Tune magnesium, Point1 and HiTeMP42 aluminum are lighter. But hey, we're arguing over a gram here... errr less than a gram.

The BBB I posted are the lightest I could find and I did a lot of research on that. But as you say it is only a g or so depending on the amount of stack you use The main draw for me is that the BBB are not only the lightest but £8 for a 40mm combo IIRC